Depo shot for 1mo.. could I be pregnant?

Sooo I got the depo shot feb 15th had a period from march 11-24th. According to Glow, I'm supposed to ovulate today.. I'm cramping like nonstop. Period cramps (dull on my left side specially. My fiancé and I had sex last night, he came in me. Are my cramps ovulation or the depos crazy side effects?